/* px em rem 等长度单位演示 */
html{
    font-size: 62.5%;/* 16px * 0.625 = 10px */
}

body{
    font-size: 10px;
}

.value_px{
    font-size: 32px;
}

.value_em{
    font-size: 2em;
}

.value_rem{
    font-size: 2rem;
}

/* 颜色值 */
.color_name{
    color: red;
}

.color_hex{
    color: #00fff0;
}

.color_fun{
    color: rgb(0,0,225);
}

/* 图片函数url */
.img_url{
    width: 262px;
    height: 70px;
    background-image: url("qq_logo.png");
}

/* 常见字体样式属性 */
.font_demo{
    font: 400;
    font-family: "华文中宋"，Arial, Helvetica, sans-serif,serif,monospace;
    font-size: 2em;
    font-style: italic;
    font-weight: 100;
}

/* 常见文本样式属性 */
.text_demo{
    font-size: 2em;
    border: 1px solid black;
    width: 30rem;
    height: 10rem;
    text-align:center;
    line-height: 10rem;
    text-decoration: line-through;
    text-indent: 3rem;
    letter-spacing: 1rem;
    word-spacing: 1rem;
}

/* 列表样式属性 */
.list_demo{
    list-style: circle inside;
}

